Core for making hollow castings.



l PATENTED MAET 2, 1905..

T. H. SYMINGTON. GORE FOR MAKING HOLLOW CASTINGS. APPLIGATION FILED DB0. 7, 100s.

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WITN ESSES No. 788,612. PATENTED MAY 2, ).905.V T. H. SYMINGTON.

CORE POR MAKING HOLLOW CASTINGS.

APPLICATION FILED DEO.7,1903.

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INVENTOR THWf/M? 5P/e ATTYS WlTNESSES Mn, VQ(

STATES THOMAS HARRISON SYMINGTON,

TO THE T. WARE.

Patented May 2, 1905.

PATENT OEEICE.

CORE FOR MAKING HOLLOW CASTINGS.

SPECIFICATION forming part of Letters Patent N o. 788,612, dated May 2, 1905.

Application filed December '7, 1903. Serial No. 184,111.

To @ZZ whom it may concern,.-

Be it known that I, THOMAS HARRISON SYM- ING'roN, a citizen of the United States or' America, residing at Calvert Building, Baltimore city, Maryland, (and whose post-oiiice address is OalvertBuilding, Baltimore city, Maryland,) have invented certain new and useful Improvements in Cores for Making Hollow Castings, of which the following is a specification.

My invention relates to a core used for casting, and is specially designed for the manufacture of a cheap and practical core for casting journal-boxes for railroad-cars.

In the casting of journal-boxes heretofore difculty has been experienced in getting a green core to stand up during handling and casting; This may be accomplished by baking the whole core; but this is diicult and expensive. I have invented a core which is entirely practical and at the same time easy to handle, strong, and cheap to construct.

My invention consists of a core for casting journal-boxes the lower portion of which is of dry sand and is suspended from a suitable support, the upper portion of which is of green sand and is supported by the dry part, thus forming a strong and comparatively cheap core for a complicated casting.

In the drawings, Figure 1 is a vertical section of a core-box in which the dry core is made. Fig. 2 is a vertical section ofthe corebox in which the green core is made superimposed upon the dry core. Fig. 3 is a plan of the completed core. Fig. 4 is a side elevation of the completed core. Fig. 5 is a vertical y longitudinal section of the mold with the core in full elevation and showing the casting in section.

Referring to Fig. l of the drawings, l is a core-box in which is molded a sand core 2, and when made a staple 3 is embedded in it.

This core 2 when molded is removed from its core-box and baked in an oven, so as to give it the desired degree of hardness and strength so that it may be suspended from a rod 5 when placed in the green-sand-core box and in the mold and also so that it lnay safely sustain the weight of the green-sand core which is built up upon it.

Referring to Fig. 2 ot' vthe drawings, 4 is the green-sand-core box, in the lower part of which the dry-sand core 2 is suspended from the rod 5, which passes through the core-box and the two ends of which rest in the openings in either end of the core-box. 6 is a drysand core made in another core-box and baked and Set up in a suitable groove in the corebox, so as to be incorporated into the core. The vacant part of the core-box is then packed with green sand occupying the space marked 7 in Figs. 2, 3, 4, and 5, and the core is complete, as shown in Figs. 3 and 4. The core is then removed from the corebox and placed in the mold 8, as shown in Fig. 5, and a box cast within the mold and around the core, as shown in Fig. 5 at 9.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s-

A core for casting composed of a section ot' baked sand, a hanger embedded in said baked portion, asupport cooperating with the hanger to support the baked section and a section composed of green sand superimposed upon the baked sand.

Signed by me at Baltimore city, Maryland, this 9th day of November, 1903.

THOMAS HARRISON SYMINGTON.

Witnesses:

T. BAYARD IVILLLAMS, THORVALD A. LEE. 

